When con artists claim their product promotes hair growth, ask yourself how much hair growth exactly? Potentially they could mean the growth of a single hair fiber. Perhaps they mean a cosmetically unacceptable vellus hair growth (baby hair). If they claim hair regrowth for their product find out what kind of regrowth, what type of hair, how quickly does it grow, what area it grows in, how dense it is, and how long it lasts.

Most clinical trials for hair growth drugs will involve statistical evaluation. An area of scalp is selected and then the hair density and growth rate is monitored throughout the study. This information is compared to results for other people and it is also compared to a control group that received a placebo to obtain a true statistical evaluation of the product. All of this generates a lot of statistical data at least some of which should be available to the consumer.